加信噪声，经希尔伯特变换，在经过滤波器，产生单边带调幅信号-Plus letter noise, the Hilbert transform, through the filter, producing a single sideband amplitude modulation signal

用于希尔伯特变换，里面有HHT谱计算程序，不是rilling版本，用改进的Hilbert变换，效果好一些-For the Hilbert transform with HHT spectrum calculation program, not rilling version, with the improvement of the Hilbert transform, effect is better

HHT就是先将信号进行经验模态分解（EMD分解），然后将分解后的每个IMF分量进行Hilbert变换，得到信号的时频属性的一种时频分析方法。-HHT is the first signal empirical mode decomposition (EMD decomposition), and then each IMF component decomposed Hilbert transform, frequency analysis method of time-frequency pro